Cabbage Wrap for Swelling, Pain and Infection

Boiled cabbage leaves applied to breast then covered with plastic wrap left overnight. This was done for 3 nights. This cured a postoperative hematoma. After a lumpectomy a hematoma formed, causing swelling and pain. The cabbage leaves drew the old blood through the inscision. Can cabbage leaves be used to relieve edema? Does anyone know any other remedies for edema?